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Financial Results that Impact Comparability by Quarter (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 4 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 14, 2017 | Dec. 30, 2017 | Oct. 07, 2017 | Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Apr. 22, 2017 | Jul. 15, 2017 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Gain on divestiture | $ (28,875) |  |  |  |  |  | $ (28,875) |  | $ (28,875) |  |
Restructuring and related impairment charges |  | $ 3,581 | $ 100,549 |  |  |  |  |  | 104,130 |  |
Multi-employer pension plan withdrawal costs |  |  | 18,268 |  |  |  |  |  | 18,268 |  |
Impairment of assets |  |  |  | $ 24,877 |  |  |  |  |  | $ 24,877 | $ 3,771
Pension settlement loss |  | 1,619 | $ 3,030 | $ 173 | $ 1,832 | $ 4,641 |  | $ 0 | 4,649 | $ 6,646 |
Income tax benefit resulting from Tax reform |  | $ (48,160) |  |  |  |  |  |  | $ (48,160) |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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